import React, { Component } from 'react'
import PropTypes from 'prop-types'
import './index.css'

export default class Footer extends Component {
  static propTypes = {
    todos: PropTypes.array.isRequired
  }

  // 全选回调
  handleCheckAll = (event) => {
    console.log('event', event)
    this.props.checkAllTodo(event.target.checked)
  }

  //清除所有完成的回调
  handleClearAllDone = () => {
    this.props.clearAllDone()
  }

  render() {
    const {todos} = this.props
    // 已完成个数
    const doneCount = todos.reduce((pre, cur) => {
      return pre + (cur.done ? 1 : 0)
    }, 0)
    // 总数
    const total = todos.length
    return (
      <div className="todo-footer">
        <label>
          <input type="checkbox" onChange={this.handleCheckAll} checked={(doneCount === total && total !== 0) ? true : false}/>
        </label>
        <span>
          <span>已完成{doneCount}</span> / 全部{total}
        </span>
        <button onClick={this.handleClearAllDone} className="btn btn-danger">清除已完成任务</button>
      </div>
    )
  }
}
